Abstract
This work was led the town of Cotonou in Benin and particularly on the vegetable garden site of Houéyiho. It involved the valorization of the waste of this site by proceeding the aerobic composting of the biodegradable fraction of municipal solid waste collected in the markets. This consists among other rotten fruits of various plant debris and garbage obtained by initial sorting. After three months of biological decomposition, 48,531.78 kg of biodegradable waste was composted with a yield of 40,443.33 kg of fresh compost or approximately 83.33% compost. The moisture content of the biodegradable fraction is 65%. The physico-chemical characteristics of compost produced are as follow: 12.7594 ± 0.1006 mg / kg of heavy metals, the C / N ratio is 13% and the rate of total phosphorus is 0.34% and 61.18 meq/100 g of Dry Weight exchangeable bases. The humus of our compost has a high capacity of cationic exchange (CCE) and fixed mineral nutrient ions such as K+ and Ca2+ and phosphate in order to make them available for plant growth and development and proving the poverty of the soil of this site and their increased need of organic amendment.Keywords: Cotonou; biodegradable waste; compost; physico- chemical characteristics; poor soil
Highlights
During the last decade, African towns are facing a serious urban development problem due the increasing in his population over the last two decades
The obtained compost has been summit to physic-chemical parameters analysis in order to assess its quality and the possibility to be used as fertilizer for soil amendment
The similarities in composition and physico-chemical characteristics between soils and sediments have motivated the use of these standards
Summary
African towns are facing a serious urban development problem due the increasing in his population over the last two decades This strong population growth is accompanied by a significant production of garbage disposal which become a concerns for municipalities (In info CREPA, 1995). The excess nonevacuated and estimated at 60% per day, affects life quality of inhabitants of Cotonou which have a unhealthy lifestyle Another observation is that some people live with their waste. The situation is of the concern because these wild dumps are located, in swamps and serve lavatories riparian populations These marshes which were natural runoff receptacles are subject to rapid filling whose consequences are manifested by floods in the rainy season. Parameters such as dry matter, moisture, mineral matter, organic matter, total organic carbon, inorganic carbon , iron, total nitrogen , N / C ratio , total phosphorus, nitrate , pHwater, pHKCl, exchangeable basis, CEC, size and heavy metals (lead) were measured
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